Air quality
Show live AQI and particulate readings on your weather website, from a Davis AirLink, an Ecowitt WH41/WH43/WH45/WH46, or any PM sensor a relay uploads.
If your station reports particulates, your site shows an Air quality tile and tab as soon as the readings arrive. There is nothing to switch on.
What visitors see
- The current AQI with its colour-coded category, on the standard you chose, and the pollutant (PM2.5 or PM10) driving it.
- Live PM1, PM2.5 and PM10 in µg/m³, plus PM4 and CO2 (with its 24-hour mean) where the sensor reports them.
- PM2.5 and PM10 averaged over the last 1, 3 and 24 hours, and the US EPA NowCast, which weights recent hours more when the air is changing fast. An AirLink supplies its own; for other sensors they are computed from your archive.
- Each extra Ecowitt PM2.5 channel, and a second indoor sensor when you name one (see below).
- A chart of air quality over time.
Choosing an AQI standard
Pick the scale your visitors know under Manage → Advanced → Weather calculations → Air quality → Air Quality Index standard. The card appears once your station has an air quality sensor.
| Standard | Region | Scale |
|---|---|---|
| European AQI (EEA) (default) | European Union | Six bands, Good to Extremely poor |
| US EPA AQI | United States | 0-500, with the 2024 PM2.5 breakpoints |
| UK Daily Air Quality Index | United Kingdom | 1-10 in four bands |
| Common AQI (CAQI) | European cities | 0-100 |
| Canada AQHI | Canada | 1-10+, PM2.5 only |
| Australia NEPM AQI | Australia | 100 is the national standard |
| Luchtkwaliteitsindex (LKI) | Netherlands | 1-11 |
| BelAQI | Belgium | 1-10 |
The index is computed from your PM2.5 and PM10, and the worse of the two sets the headline. Canada's AQHI has no PM10 term, so a PM10-only sensor shows no index on that standard.
The headline scores the live reading against the standard's breakpoints, not its official 1-hour or 24-hour averaging window. The rolling means on the tab cover the official windows.
Supported sensors
- Davis AirLink, found when you connect WeatherLink. Added one later? Open Setup → Connection and choose Reconnect.
- Ecowitt WH41 or WH43 (PM2.5) and WH45 or WH46 (PM and CO2), through the gateway's Customized upload or your ecowitt.net connection.
- Any PM sensor a relay reads (weewx, Meteobridge, CumulusMX), as long as the upload URL carries the particulate fields. The ready-made URLs in Connect other hardware do.
If your AirLink is a station of its own
An AirLink bought separately usually appears in WeatherLink as its own station. You do not need to choose between the two: keep your weather station selected under Website → Homepage → Stations and cards and the air quality readings are picked up from the AirLink automatically, including charts and PM2.5 alerts.
If you run two sensors
WeatherLink cannot tell which of two AirLinks is indoors. Paste the indoor one's sensor id under Manage → Advanced → Weather calculations → Air quality → Indoor air quality sensor. The other becomes your outdoor reading, and the indoor PM and humidity get their own block on the tab. With one sensor, leave it empty.
Alerts
PM2.5 above, PM10 above and CO₂ above alerts tell you about poor air without watching the site.